Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

I have a propane furnance, forced air. Two rooms are not used. Is it ok to block both the supply and return vents with magnetic vent covers in those rooms? It should reduce my heating costs correct? Thanks

Your system is designed to move a certain amount of air and if you cut that flow down, the equipment will be working harder.
The fan will push the same amount against a greater static pressure and overwork the fan and overheat the exchanger.

it really depends on your system. if you have the minimum number of vents required, then covering anything could cause damage. on the other hand, if you have many more vents than the minimum, you could cover some with no ill effects. you could have a contractor look at your system and see if it is ok for you to cover a few vents.